Đọc thêm cách load interface (ok)
https://wordpress-lionel.gitbook.io/wordpress-advand/su-dung-namespace-and-autoload-trong-plugin-phan-4-day-cung-la-cach-viet-add_meta_box-trong-class-ok
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https://wordpress-lionel.gitbook.io/wordpress-advand/su-dung-namespace-and-autoload-trong-plugin-phan-4-day-cung-la-cach-viet-add_meta_box-trong-class-ok
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Full code